Re: [PATCH] regex.3: "([^...])" is not an end of sentence

["G. Branden Robinson" <g.branden.robinson@gmail.com>]

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Hi Tom,

At 2023-07-08T10:10:01+0000, Tom Schwindl wrote:
> On Sat Jul 8, 2023 at 5:11 AM CEST, наб wrote:
> > diff --git a/man3/regex.3 b/man3/regex.3
> > index 13e540b22..630c0369d 100644
> > --- a/man3/regex.3
> > +++ b/man3/regex.3
> > @@ -109,7 +109,7 @@ .SS Compilation
> >  Match-any-character operators don't match a newline.
> >  .IP
> >  A nonmatching list
> > -.RB ( [\[ha]...] )
> > +.RB ( [\[ha]...\&] )
> >  not containing a newline does not match a newline.
> >  .IP
> >  Match-beginning-of-line operator
> 
> I cannot reproduce this on my system; only one space is rendered.

You may have the inter-sentence space amount configured to zero.[1]

I get the extra space with all of DWB 3.3 nroff, Heirloom Doctools
nroff, mandoc, and groff.

$ printf '.ll 100n\nA nonmatching list\n([\(ha...])\nnot containing a newline does not match a newline.\n' | groff -Tascii | cat -s
A nonmatching list ([^...])  not containing a newline does not match a newline.

[cd DWB][2]
$ printf '.ll 100n\nA nonmatching list\n([\(ha...])\nnot containing a newline does not match a newline.\n' | DWBHOME=. ./bin/nroff | cat -s
A nonmatching list ([...])  not containing a newline does not match a newline.

[cd Heirloom]
$ printf '.ll 100n\nA nonmatching list\n([\(ha...])\nnot containing a newline does not match a newline.\n' | ./bin/nroff | cat -s
A nonmatching list ([^...])  not containing a newline does not match a newline.

$ printf '.ll 100n\nA nonmatching list\n([\(ha...])\nnot containing a newline does not match a newline.\n' | mandoc | cat -s
()                                                                          ()

A nonmatching list ([^...])  not containing a newline does not match a newline.

                                                                                                  ()
Regards,
Branden

[1] Adding the following line to your man.local file in a groff
    installation would do the trick.

    .ss 12 0

    In groff, this is also the default for several "groff locales",
    including "cs", "de", "fr", "sv", and, new in groff 1.23.0, "it".

[2] I respelled the \[ha] special character escape sequence in legacy
    form for greater portability, but the "ha" special character _name_
    is not recognized by DWB troff (which has not been maintained for
    about 30 years).

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